Sabulina is a genus of about 74 species of small flowering plants in the family Caryophyllaceae (the pink or carnation family), placed in the order Caryophyllales. Commonly referred to as sandworts, the genus is distributed across temperate and subtropical North America, Eurasia, and North Africa, with species adapted to rocky ledges, stony soils, scree, and sandy ground in montane to alpine habitats.
Members of the genus are typically small annual or perennial herbs with slender, often linear or needle-like leaves. Flowers are characteristically small and white with five petals, five acute sepals, and three styles that produce a three-parted capsule at maturity — a suite of features shared with the closely related genus Minuartia.
The genus as currently circumscribed is the result of a major 2014 molecular phylogenetic revision by Dillenberger and Kadereit, who demonstrated that the previously broadly defined Minuartia sensu lato was polyphyletic. That work redistributed species among several reinstated or newly described genera, with Sabulina receiving species that had long been treated under Minuartia and, before that, under Arenaria and the obsolete genus Alsine. The genus name itself refers to Latin sabulum (coarse sand), evoking the characteristic habitat of many members.
Notable species include Sabulina verna (spring sandwort), widespread across Europe and frequently found on calcareous and metalliferous substrates; Sabulina tenuifolia and Sabulina stricta, recorded from Europe and northern latitudes; and Sabulina austromontana (Columbian sandwort) from western North America. North American members also include Sabulina texana, Sabulina pusilla, and Sabulina elegans.
Etymology
The genus name Sabulina derives from the Latin sabulum, meaning coarse sand, in reference to the sandy and stony habitats where many species grow. The genus was separated from the broadly defined Minuartia following a 2014 phylogenetic revision by Dillenberger and Kadereit.
Distribution
Sabulina species are native to temperate and subtropical regions of North America, Eurasia, and North Africa. The range spans Europe (including the Mediterranean and northern latitudes), the Caucasus, western and central Asia, Far Eastern Russia, Japan, and parts of North America from the western cordillera to the eastern and southern United States.
Taxonomy Notes
Sabulina was circumscribed in its modern sense by Dillenberger & Kadereit in 2014 as part of a molecular reassessment of the polyphyletic genus Minuartia sensu lato. Species now placed in Sabulina had previously been treated under Minuartia, Arenaria, and the obsolete Alsine. The recircumscription also established or reinstated related genera including Cherleria, Eremogone, Facchinia, Mcneillia, Mononeuria, Pseudocherleria, Rhodalsine, and Triplateia. GBIF recognises the genus as accepted within Caryophyllaceae, order Caryophyllales.
